/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jms.example.durable.sub;

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;
import java.util.concurrent.CountDownLatch;

/**
 * @author <a href="http://www.christianposta.com/blog">Christian Posta</a>
 */
public class Subscriber implements MessageListener {
	private static final String BROKER_URL = "tcp://localhost:61616";

	private static final Boolean NON_TRANSACTED = false;

	private final CountDownLatch countDownLatch;

	public Subscriber(CountDownLatch latch) {
		countDownLatch = latch;
	}

	public static void main(String[] args) {
		String url = BROKER_URL;
		if (args.length > 0) {
			url = args[0].trim();
		}
		System.out.println("\nWaiting to receive messages... Either waiting for END message or press Ctrl+C to exit");
		ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("admin", "password", url);
		Connection connection = null;
		final CountDownLatch latch = new CountDownLatch(1);

		try {

			connection = connectionFactory.createConnection();
			String clientId = System.getProperty("clientId");
			connection.setClientID(clientId);

			connection.start();

			Session session = connection.createSession(NON_TRANSACTED, Session.AUTO_ACKNOWLEDGE);
			Topic destination = session.createTopic("test-topic");

			MessageConsumer consumer = session.createDurableSubscriber(destination, clientId);
			consumer.setMessageListener(new Subscriber(latch));

			latch.await();
			consumer.close();
			session.close();

		} catch (Exception e) {
			System.out.println("Caught exception!");
		} finally {
			if (connection != null) {
				try {
					connection.close();
				} catch (JMSException e) {
					System.out.println("Could not close an open connection...");
				}
			}
		}
	}

	@Override
	public void onMessage(Message message) {
		try {
			if (message instanceof TextMessage) {
				String text = ((TextMessage) message).getText();
				if ("END".equalsIgnoreCase(text)) {
					System.out.println("Received END message!");
					countDownLatch.countDown();
				} else {
					System.out.println("Received message:" + text);
				}
			}
		} catch (JMSException e) {
			System.out.println("Got a JMS Exception!");
		}
	}
}